1. He concluded that these expressions evolved through natural selection. 
   他得出结论，这此表达方式经自然选择演变而来。
2. To reach the later stages of a selection process or contest by competing successfully in earlier rounds. 
   取得…的资格在较早的回合中，通过成功地竞争而达到竞选过程或竞赛的最后阶段
3. She went through the transcript carefully, to eliminate all errors from it. 
   她把誊本从头至尾认真地看了一遍，以消除其中的错误之处。
4. She went through the typescript carefully to eliminate all errors from it. 
   她仔细阅读打字稿，以消除所有错误。
5. Cadres should be selected after the basis for the selection has been laid through Party consolidation.  
   要在整党的基础上挑选干部。

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